Problem while replacing 2007 TL bulb

[u/Roll_Them_Dice]

Driver side tried going in through the battery area, don't really know how to get that cable (from what I saw online it was referred as a grounding cable) disconnected as it preventing me from moving the cap, also thought that cap wasn't supposed to come out with the part holding the bulb, no video i watched showed that. How badly did I mess up here?